Test library
Peanut Specific IgE Test
This blood test measures IgE antibodies to whole peanut extract, helping assess peanut sensitization. Component testing can add detail when ordered with the panel.
Order Peanut Allergy Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Peanut Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The Whole Peanut Allergy Test is a blood test that checks for IgE antibodies against a peanut extract. Peanut is a legume and one of the more common food allergens, and reactions can range from mild mouth itching to more serious symptoms. The test helps show whether the immune system has become sensitized to peanut proteins, and it is usually reviewed together with the person's reaction history and any component test results.
What this test measures
Peanut contains multiple proteins that can bind IgE, including well-studied components such as Ara h 1, Ara h 2, and Ara h 3. A whole-extract test measures IgE against the mixture of proteins in peanut, giving an overall picture of sensitization. This broad measurement is useful for screening, and component tests can be added when more specific information is needed.
Only a blood sample is required for this test. Results are usually reported as a quantitative value in kilounits per liter with a graded class, and some orders also include total serum IgE or peanut component markers. Because antibody levels overlap between people with mild and severe reactions, the number alone does not predict what a future reaction would be like.
People who have had symptoms after eating peanuts or peanut-containing foods may order this test, as may those with other food allergies or eczema being evaluated for peanut sensitization. It can also be used to follow up on a previous result. A qualified healthcare provider should interpret the finding with the person's history, examination, and any additional testing.
- Whole peanut extract-specific IgE antibodies
- Ara h 1 component when component testing is included
- Ara h 2 component when component testing is included
- Ara h 3 component when component testing is included
- Other peanut components when an expanded panel is ordered
- Quantitative allergen-specific IgE in kU/L
- Allergen-specific IgE class on a graded scale
- Total serum IgE when included
Why people order this test
- Investigate symptoms that follow peanut or peanut butter consumption
- Assess sensitization in people with eczema or other food allergies
- Add detail to a broader food allergy evaluation
- Follow up on a previous peanut allergy screening result
- Support discussions about peanut avoidance and emergency planning
- Clarify reactions to foods that may contain hidden peanut ingredients
How to prepare
No fasting is required for this test. A blood sample is collected at the lab, and normal meals are generally fine beforehand. Follow the lab's instructions if the order includes other tests.
Understanding your results
Results are usually reported within one to three business days. A positive result indicates sensitization to peanut proteins, while a negative result makes peanut allergy less likely. The result must be interpreted by a healthcare provider along with your symptoms and history.
Peanut Specific IgE Test by state
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Connecticut
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Frequently Asked Questions
Is peanut a nut?
Peanut is a legume, not a tree nut. However, people with peanut allergy sometimes also react to tree nuts, and separate tests are used to check for that.
What is the difference between whole peanut and component testing?
The whole-extract test measures IgE against the full mixture of peanut proteins. Component tests measure individual proteins such as Ara h 2 and can provide more specific information when a clinician needs it.
Can a high result tell me how severe my allergy is?
No. IgE levels overlap substantially between mild and severe reactions, so the number cannot predict severity. Your healthcare provider considers your reaction history and other factors.
Can the test detect peanut in foods I have eaten?
No. This test measures your immune system's antibodies, not peanut residues in food. It shows sensitization rather than recent consumption.
How is the blood sample collected?
A small blood sample is drawn from a vein, usually in the arm, during a short lab visit.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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